The position of a mass on a spring is given by x = (3.8 cm) cos[2t/10.88 s)]. (a) What is the period, T, of this

The position of a mass on a spring is given by x = (3.8 cm) cos[2πt/10.88 s)].

(a) What is the period, T, of this motion?

(b) Where is the mass at t = 0.55 s?

(c) Show that the mass is at the same location at 0.55 s + T seconds as it is at 0.55 s.